WO2017040914A1 - Découpage bidirectionnel d'une alimentation à haute tension pour outils de fond de trou à haute température pour réduire la taille d'outil - Google Patents

Découpage bidirectionnel d'une alimentation à haute tension pour outils de fond de trou à haute température pour réduire la taille d'outil Download PDF

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Publication number
WO2017040914A1
WO2017040914A1 PCT/US2016/050086 US2016050086W WO2017040914A1 WO 2017040914 A1 WO2017040914 A1 WO 2017040914A1 US 2016050086 W US2016050086 W US 2016050086W WO 2017040914 A1 WO2017040914 A1 WO 2017040914A1
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WO
WIPO (PCT)
Prior art keywords
downhole tool
signal
power signal
power
frequency
Prior art date
Application number
PCT/US2016/050086
Other languages
English (en)
Inventor
Saurabh KULKAMI
Original Assignee
Baker Hughes Incorporated
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Baker Hughes Incorporated filed Critical Baker Hughes Incorporated
Publication of WO2017040914A1 publication Critical patent/WO2017040914A1/fr

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
    • E21B41/0085—Adaptations of electric power generating means for use in boreholes
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B47/00—Survey of boreholes or wells
    • E21B47/12—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
    • H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
    • H02M5/22—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M5/275—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M5/293—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/66—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
    • H02M7/68—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
    • H02M1/007—Plural converter units in cascade
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
    • H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
    • H02M5/22—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
    • H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
    • H02M5/22—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M5/275—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M5/297—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal for conversion of frequency
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration

Definitions

  • the present disclosure provides a method and apparatus for providing power to a tool in a wellbore, and in particular, to a method of powering the downhole tool from a surface location so as to reduce the size of transformers used in the downhole tool.
  • Wireline tools for example, include a downhole tool suspended from the surface location via a cable that supports the downhole tool and which includes electrical conductors for providing power from a power source at the surface location to the wireline tool.
  • Transformers are often used in these downhole tools in order to step down high voltage alternating current (AC) provided from the surface power source and to provide galvanic isolation between the power source and the electrical equipment of the downhole tool.
  • AC high voltage alternating current
  • the size requirements of a transformer are directly related to the frequency of the power signal. It is further noted that as power load increases, transformers are often connected in parallel to meet power requirements.
  • transformers that are as small as possible.
  • One way of reducing the size of the transformers in the downhole tool is to increase the frequency of the alternating current (AC) power sent from the surface.
  • AC alternating current
  • high frequency voltage along the cable increases transmission losses and requires the
  • the present invention therefore provides a method and apparatus for providing power to downhole tools with reduced transformer size.
  • the present disclosure provides a method of operating a downhole tool, the method including: supplying a first power signal from a power source at a first frequency; chopping the first power signal at the downhole tool to generate a second power signal having a second frequency greater than the first frequency; and using the second power signal to operate the downhole tool.
  • the present invention provides a downhole tool that includes a bidirectional chopper that receives a first power signal at a first frequency and chops the first power signal to generate a second power signal having a second frequency greater than the first frequency; and a unit of the downhole tool that is powered using the second power signal.
  • the present invention provides a system for operating a downhole tool, including: a power source configured to supply a first power signal at a first frequency; a bidirectional chopper configured to receive the first power signal and chop the first power signal to generate a second power signal having a second frequency greater than the first frequency; and a unit of the downhole tool configured to operate using the second power signal.
  • FIG. 1 shows an exemplary downhole tool in one embodiment of the present invention which employs a bidirectional chopper for converting a frequency of a power signal at the downhole tool;
  • FIG. 2 shows a detailed view of the exemplary bidirectional chopper of the downhole tool in one embodiment
  • FIG. 3 shows an exemplary circuit diagram for a downhole tool illustrating a placement of the bidirectional chopper with respect to other circuitry of the downhole tool
  • FIG. 4 shows a comparison between a conventional downhole tool and a downhole tool which uses the bidirectional chopper circuit. DETAILED DESCRIPTION OF THE DISCLOSURE
  • FIG. 1 shows an exemplary downhole tool 100 in one embodiment of the present invention which employs a bidirectional chopper 104 for converting a frequency of a power signal at the downhole tool.
  • the downhole tool 100 is a wireline tool.
  • the downhole tool 100 may be a drilling tool, including a measurement-while-drilling tool or a logging-while drilling tool or other downhole tools.
  • the downhole tool 100 is lowered into a wellbore 118 penetrating an earth formation 120.
  • a cable 102 extends from a power supply 122 (generally at a surface location) to the downhole tool 100 in the wellbore 118.
  • the power supply 122 provides a first power signal to the downhole tool 100 along cable 102.
  • the first power signal is provided along cable 102 to the downhole tool 100 at a first frequency.
  • the first frequency can be a standard power frequency.
  • the standard power frequency can be about 50 Hertz (Hz) or about 60 Hz in various embodiments. However, the first frequency is not meant to be limited to these frequencies.
  • the downhole tool 100 includes a bidirectional chopper circuit 104 that changes a frequency of the power signal.
  • the chopper circuit 104 receives the first power signal from the cable 102 and generates a second power signal by chopping the first power signal, thereby producing the second power signal having a second frequency.
  • the second frequency is within a range from about 400 Hz to about 1 kHz in various embodiments, although other frequencies and frequency ranges may be achieved using the bidirectional chopper circuit 104. In one aspect of the invention, the second frequency is greater than the first frequency
  • a transformer 106 receives the chopped power signal at the second frequency from the bidirectional chopper circuit 104 and produces a high voltage power signal as an output signal which can be used at various downhole tool elements, such as Motor Power Supply Electronics 108 which drives Motor Mechanical Assembly 110 as well as any other circuitry of the downhole tool
  • FIG. 2 shows a detailed view of the exemplary bidirectional chopper
  • the bidirectional chopper disclosed herein employs eight discrete silicon carbide MOSFETs (metal-oxide-semiconductor field-effect transistors).
  • Suitable transistors may include, but are not limited to, conventional silicon transistors and insulated-gate bipolar transistor (IGBTs), and can be made from wide band- gap materials, including, but not limited to, silicon carbide and gallium nitride.
  • Silicon carbide transistors are generally used as the transistors. Silicon carbide transistors are known to work at temperatures above 200 degrees Celsius. Commercial AC switches using thyristors do not work at high temperatures, while insulated gate bipolar transistors are generally usable only up to about 200 degrees Celsius.
  • an AC waveform at a first frequency may be chopped to generate a waveform at second frequency ("switching frequency (f sw )") within a frequency range that is higher than the first frequency.
  • the first frequency is in a range from about 50 Hz to about 60 Hz and the second frequency is in a range from about 400 Hz to about 1 kHz.
  • the chopper shifts the energy of the waveform from 60 Hz to f sw +-60 Hz.
  • freq_2 f sw +-freq_l .
  • the transformer in the downhole tool is reduced in size while still providing the same amount of power as transformer operating at the lower (first) frequency.
  • the transformers are reduced in size by about a factor of about two when compared to a size of a transformer currently used for transforming a 60Hz power signal for a same VA rating and input/output voltage values.
  • the bidirectional chopper 200 includes four switch sections: switch section 1 (202a), switch section 2 (202b), switch section 3 (202c) and switch section 4
  • Each switch section includes two transistors with antiparallel diodes. Switch section
  • Switch section 4 includes transistors Q7 and Q8 with antiparallel diodes D7 and D8.
  • switch section 1 (202a) is discussed as a representative of the switch sections 1-4 (202a-202d).
  • Switch section 1 (202a) includes transistors Ql and Q2.
  • Source 204S of transistor Ql is electrically coupled and/or connected to source 206S of transistor Q2 so that source 204S and source 206S are at the same electrical potential.
  • gate 204G of transistor Ql is electrically coupled and/or connected to gate 206G of transistor Q2 so that gate 204G and gate 206G are at the same electrical potential.
  • Diode Dl is connected between the source 204S and gate 204G of transistor Ql.
  • diode Dl is anti-parallel with transistor Ql.
  • diode D2 is connected between the source 206S and gate 206G of transistor Q2. Therefore, the diode D2 is anti-parallel with transistor Q2.
  • a pulse width modulated (PWM) signal is received as a control signal at switch section 1 (202a) and is supplied between gates 204G and 206G and sources 204S and 206S such that gates 204G and 206G and sources 204S and 206S all receive the same control signal.
  • PWM pulse width modulated
  • the PWM control signal is supplied to the switch sections (202a-202d) in alternating manner.
  • the PWM control signal is separated into a PWMl control signal and PWM2 control signal.
  • the PWMl control signal and PWM2 control signal are periodic waves that are 180 degrees out of phase with each other.
  • the PWMl control signal and PWM 2 control signal each have a 50% duty cycle (i.e., is active for half of its period). While the duty cycle of the PWM 1 control signal and PWM 2 control signal is 50%, this is for illustrative purposes only. The amount of the duty cycle can be varied from 50%. Such changes in the duty cycle affect the amplitude of the output signal (AC OUTl and AC OUT 2).
  • Switch section 1 (202a) and switch section 3 (202c) receive PWMl control signal while switch section 2 (202b) and switch section 4 (202d) receive PWM2 control signal.
  • the input signal (at frequency 1) comes into the bidirectional switch section as "AC_IN1 and AC_IN2" (AC_IN 1 into switch sections 1 and 2, and AC_IN 2 into switch sections 3 and 4).
  • the output signal (at frequency 2) leaves the switch section as "AC OUTl and AC OUT2" (AC OUT 1 leaving switch sections 1 and 4, and AC OUT 2 leaving switch sections 2 and 3).
  • the drains of transistors Ql and Q3 are coupled to an AC IN 1 signal, which is at a first frequency.
  • the drains of transistors Q5 and Q7 are coupled to an AC IN 2 signal, which is at a first frequency.
  • the drains of transistors Q2 and Q8 provide an
  • FIG. 3 shows an exemplary circuit diagram 300 for a downhole tool illustrating a placement of the bidirectional chopper of the present invention with respect to the other circuitry of the downhole tool.
  • Demarcation line 302 indicates a separation between equipment at a surface location 304 and equipment that is downhole 306.
  • Power supply 310 is located at the surface location 304.
  • the power supply 310 may be an alternating current power supply.
  • a cable 312 extends downhole from the surface location 302.
  • a resistance and capacitance of the cable is shown by the resistor and capacitor in box 312.
  • a motor power delivery scheme for a formation testing explorer tool is shown.
  • the tool includes two sections, an electrical assembly (EA) section 307 and a motor assembly (MA) section 308.
  • EA electrical assembly
  • MA motor assembly
  • the EA section 307 includes a bidirectional chopper 314 (such as the bidirectional chopper of FIG. 2), a transformer 316, a rectifier 318 and a filter 320. [0020]
  • the bidirectional chopper 314 receives a first power signal from the
  • the first power signal is in the form of a periodic wave having a first frequency.
  • the first frequency is from about 50 Hz to about 60 Hz.
  • the bidirectional chopper converts the first power signal having the first frequency to a second power signal having a second frequency.
  • the second frequency is generally a higher frequency than the first frequency.
  • the second frequency is in a range from about 400 Hz to about 1 kHz, although the present invention is not meant to provide a limitation on the second frequency other than that the second frequency is higher than the first frequency.
  • the second power signal, having been generated at the bidirectional chopper 314, is then received at transformer 316.
  • the transformer 316 may be a step-down transformer in various embodiments.
  • the second power signal received at the transformer 316 has a voltage amplitude in a range from about 420V AC to about 520V AC and the signal output by the transformer 316 has a voltage amplitude in a range from about 100V AC to about 150V AC, although this is not meant as a limitation of the invention.
  • the transformer 316 provides galvanic isolation of the downhole electronic equipment from the power source 310.
  • the AC voltage output from the transformer 316 is received at rectifier 318 which converts the AC voltage to a DC voltage.
  • the DC voltage is then passed through filter 320 to remove voltage transients.
  • the exemplary EA section 307 further includes a step-down DC- DC converter 322 for converting the DC voltage output by the filter 320 to a DC voltage suitable for use at the MA section 308.
  • the MA section 308 includes a brushless DC motor (BLDC motor)
  • the BLDC motor controller 324 controls operation of the BLDC motor 326 and is powered by DC power from the step-down DC-DC converter 322 of the EA section 307.
  • the BLDC motor 326 provides mechanical motion to gear box 328, which translate the mechanical motion of the BLDC motor 326 for use at ball screw 330.
  • the ball screw 330 may be used to operate machinery for drawing fluid from a formation. Other mechanical devices and mechanical operations can be powered by the BLDC motor 326 in other embodiments of the downhole tool.
  • FIG. 4 shows a comparison between a conventional downhole tool 402 and a downhole tool 404 or the present invention which uses the bidirectional chopper circuit.
  • the conventional downhole tool 402 includes a transformer 410, motor power and supply electronics 412 and a motor mechanical assembly 414.
  • the transformer 410 generally transforms the amplitude of a first power signal having a first frequency received from an uphole power source to power operations of the conventional downhole tool 402.
  • the transformer 410 outputs a signal at selected power level.
  • the downhole tool 404 of the present invention includes bidirectional chopper 420 and a "reduced-size" transformer 422, as well as the motor power and supply electronics 412 and a motor mechanical assembly 414.
  • the bidirectional chopper 420 receives the first power signal and generates a second power signal at a second frequency higher than the first frequency.
  • the reduced-size transformer 422 does not need to be as big as the transformer 410 of the conventional downhole tool to generate the same amount of power (i.e., the selected power level) as transformer 410.
  • the volume taken up by the bidirectional chopper 420 and the reduced-size transformer 422 is less than the volume taken up by the transformer 410.
  • the size of the downhole tool 404 of the present invention can be smaller than the size of the conventional downhole tool 402.
  • additional equipment can be placed into a downhole tool having the size of the convention downhole tool 402.
  • the present disclosure provides a method of operating a downhole tool, including: supplying a first power signal from a power source at a first frequency; chopping the first power signal at the downhole tool to generate a second power signal having a second frequency greater than the first frequency; and using the second power signal to operate the downhole tool.
  • a transformer is used to change a voltage of the second power signal prior to using the second power signal to operate the downhole tool and/or to galvanically isolate the downhole tool from a surface power supply.
  • the size of the transformer is less than a size of another transformer that changes the voltage of the first power signal to operate the downhole tool for a same amount of power.
  • the first power signal is chopped using a bidirectional chopper of the downhole tool.
  • the bidirectional chopper includes four switch sections.
  • a first pulse width modulated (PWM) control signal is received at a first and third of the switch sections and a second PWM control signal is received at a second and fourth of the switch sections.
  • the first PWM control signal and the second PWM control signal are 180 degrees out of phase and have a 50% duty cycle.
  • At least one of the switch sections includes two transistors with antiparallel diodes and the transistors include at least one of: (i) a silicon transistor; (ii) an insulated-gate bipolar transistor: (iii) a wide band-gap transistor; (iv) a silicon carbide transistor; and (v) a gallium nitride transistor.
  • the sources of the two transistors are electrically coupled and the gates of the two transistors are electrically coupled.
  • the first frequency is in a range from about 50 Hertz (Hz) to about 60Hz and the second frequency is in a range between from about 400 Hz to about 1 kHz.
  • the present disclosure provides a downhole tool, including: a bidirectional chopper that receives a first power signal at a first frequency and chops the first power signal to generate a second power signal having a second frequency greater than the first frequency; and a unit of the downhole tool that is powered using the second power signal.
  • the downhole tool can include a transformer configured to transform a voltage of the second power signal and/or to galvanically isolate the downhole tool from a surface power supply.
  • the transformer has a smaller size than another transformer that transforms the first power signal to a same power level as the transformer in order to power the unit.
  • the bidirectional chopper includes a four switch section and receives a first pulse width modulated (PWM) signal at a first and third of the switch sections and a second PWM signal at a second and fourth of the switch sections to control the chopping of the first power signal, wherein the first PWM signal and the second PWM signal are 180 degrees out of phase and have a 50% duty cycle.
  • At least one of the switch sections includes two transistors with antiparallel diodes, wherein the transistors include at least one of: (i) a silicon transistor; (ii) an insulated-gate bipolar transistor: (iii) a wide band-gap transistor; (iv) a silicon carbide transistor; and (v) a gallium nitride transistor.
  • the present disclosure provides a system for operating a downhole tool, including: a power source configured to supply a first power signal at a first frequency; a bidirectional chopper configured to receive the first power signal and chop the first power signal to generate a second power signal having a second frequency greater than the first frequency; and a unit of the downhole tool configured to operate using the second power signal.
  • the system can include a transformer configured to transform a voltage of the second power signal to output a signal at a selected power level. The transformer has a smaller size than another transformer that transforms the first power signal to output a signal at the selected power level.
  • the bidirectional chopper includes four switch sections and at least one of the switch sections includes two transistors, each transistor having an antiparallel diode.
  • the bidirectional chopper receives a first pulse width modulated (PWM) signal at a first and third of the switch sections and a second PWM signal at a second and fourth of the switch sections to control a chopping of the first power signal.
  • PWM pulse width modulated

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Abstract

L'invention concerne un outil de fond de trou et un procédé permettant de faire fonctionner l'outil de fond de trou. Un premier signal d'alimentation est fourni à l'outil de fond de trou à partir d'une source d'alimentation, à une première fréquence. Un découpeur bidirectionnel situé au niveau de l'outil de fond de trou découpe le premier signal d'alimentation pour générer un deuxième signal d'alimentation ayant une deuxième fréquence, supérieure à la première fréquence. Le deuxième signal d'alimentation est utilisé pour faire fonctionner l'outil de fond de trou.
PCT/US2016/050086 2015-09-04 2016-09-02 Découpage bidirectionnel d'une alimentation à haute tension pour outils de fond de trou à haute température pour réduire la taille d'outil WO2017040914A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US14/845,693 US10858911B2 (en) 2015-09-04 2015-09-04 Bidirectional chopping of high voltage power in high temperature downhole tools to reduce tool size
US14/845,693 2015-09-04

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WO2017040914A1 true WO2017040914A1 (fr) 2017-03-09

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US11955782B1 (en) * 2022-11-01 2024-04-09 Typhon Technology Solutions (U.S.), Llc System and method for fracturing of underground formations using electric grid power

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